00421nam a2200145Ia 4500008004100000040001100041050001500052100001900067245008300086260002500169300001800194490003400212650001400246700001500260100511 19721972   a   e|    |||0 ||eng|d  aABU Za  aQK 524. M4  aMitchell, D.S. 0aEcology of water weeds in the neotropics/cby D. S. Mitchell and P. A. Thomas/  aParis:bUnescoc1972  a50p.: diagrms  aTechnical papers in hydrology  aHydrology  aThomas P A